Chamberlain JDC Manual page 54

Troubleshooting (continued)
Display
Code
Message
F41 F41 EYE/
EDG1 BLK
F44
F44 EYE/
F47
EDG2 BLK
F47 EYE/
EDG3 BLK
Possible
Description
Causes
Monitored eyes/ Obstruction
edges 1/2/3 in doorway is
blocked for 3 blocking eye or
minutes or more contacting edge
improperly
configured eye/
edge input
Unapproved
safety device is
being used
Photoeyes
misaligned
Wiring fault to
photoeye emitter
Resistive type
edge shorted or
shorted wiring
Sunlight causing
photoeye
blocking
condition
Damaged photo
eyes or edge
Damaged
powerhead main
board
Diagnosis
Check for obstructions
Check system settings item
in the menu to check the
device type setting for the
input
Ensure the safety device is
approved for use with the
operator
Check alignment
Check that the photoeye
emitter is powered and
wired correctly. LED on
emitter is lit.
Check for short circuits in
the wiring or in the resistive
edge.
Block sunlight from shining
in the receiver and check if
photoeye remains blocked
Swap safety device with
known-good device
A properly functioning
resistive edge should
measure 8-14 kOhm in the
normal unobstructed state
Swap safety device with
known-good device
connected directly to the
powerhead main board
54
Resolution
If obstructions are
present, remove the
obstruction
Ensure the safety device
type matches the device
that is actually installed
Replace the safety
device with one that is
approved for use with the
operator
If eyes are misaligned,
correct the alignment
Correct wiring faults
Correct any wiring faults
Resolution for this
issue may be difficult.
Swapping the emitter
and receiver can
sometimes provide
relief from the issue, but
other times just causes
the issue to surface at
another time of day.
If a known-good safety
device works, replace the
faulty safety device
If the main board still
won't detect known-
good safety devices
connected directly to the
board, power cycle the
operator.
If the problem persists,
reset to factory defaults
and configure again.
If problem still persists,
replace the powerhead
main board.